NMAT is an examination mainly conducted for admission into Narsee Monjee Institute. However, a couple of other colleges like Shiv Nadar University, Xaviers Bhubaneshwar, Amity University, SRM university etc do accept the NMAT score.

In general for all Xaviers universities there is a common entrance test called the XAT. I would advise you to take up that test for entrance into Xaviers Kolkata